rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (3 ticks this GP) idle=a3cc/1/0x4000000000000000 softirq=39269/39269 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=40837, q=623 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3464 Comm: kworker/u4:10 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:__raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline]
RIP: 0010:_raw_spin_lock+0x36/0x40 kernel/locking/spinlock.c:154
Code: 00 e8 7e 55 ea f6 48 8d 7b 18 31 f6 31 d2 31 c9 41 b8 01 00 00 00 45 31 c9 ff 74 24 08 e8 32 e1 f5 f6 48 83 c4 08 48 89 df 5b <e9> d5 30 f7 f6 0f 1f 44 00 00 f3 0f 1e fa 55 48 89 e5 41 57 41 56
RSP: 0018:ffffc90000007c68 EFLAGS: 00000096
RAX: b3a16116363cc900 RBX: ffff888059170b58 RCX: b3a16116363cc900
RDX: 0000000000000000 RSI: ffffffff8aaace60 RDI: ffff88807e7cd2e8
RBP: 0000000000000002 R08: dffffc0000000000 R09: 1ffffffff21b28d8
R10: dffffc0000000000 R11: fffffbfff21b28d9 R12: ffff88807e7cd340
R13: ffff88807e7cd000 R14: ffff888059174000 R15: 1ffff11005bc08d9
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563c3597e485 CR3: 000000006453f000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 spin_lock include/linux/spinlock.h:351 [inline]
 advance_sched+0xc5/0xc80 net/sched/sch_taprio.c:940
 __run_hrtimer kernel/time/hrtimer.c:1750 [inline]
 __hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1814
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:unwind_next_frame+0x1d1f/0x2970 arch/x86/kernel/unwind_orc.c:672
Code: 00 eb 05 e8 83 d0 4a 00 bf 01 00 00 00 e8 89 ae 20 00 65 8b 1d 7a f5 c8 7e 31 ff 89 de e8 19 d4 4a 00 85 db 0f 84 e6 02 00 00 <e8> 5c d0 4a 00 b0 01 e9 28 05 00 00 e8 50 d0 4a 00 48 8b 5c 24 58
RSP: 0018:ffffc9000ca77290 EFLAGS: 00000286
RAX: ffffffff813ac057 RBX: 0000000080000000 RCX: 0000000000000000
RDX: ffff88802de03c00 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000ca773c8 R08: ffff88802de03c00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc9000ca773c8
R13: dffffc0000000000 R14: ffffc9000ca77460 R15: ffffc9000ca773d8
 __unwind_start+0x66a/0x7e0 arch/x86/kernel/unwind_orc.c:760
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xf8/0x190 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1811 [inline]
 slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 __kmem_cache_free+0xba/0x1f0 mm/slub.c:3843
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1614 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x1981/0x2ac0 net/mac80211/ibss.c:1642
 ieee80211_iface_process_skb net/mac80211/iface.c:1651 [inline]
 ieee80211_iface_work+0x717/0xc70 net/mac80211/iface.c:1705
 cfg80211_wiphy_work+0x225/0x260 net/wireless/core.c:437
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g40837 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=24397
rcu: rcu_preempt kthread starved for 10502 jiffies! g40837 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:27752 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3464 Comm: kworker/u4:10 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:105 [inline]
RIP: 0010:do_raw_spin_unlock+0xed/0x230 kernel/locking/spinlock_debug.c:140
Code: 7c 25 00 00 74 08 4c 89 f7 e8 8f b1 74 00 49 c7 06 ff ff ff ff 42 0f b6 44 25 00 84 c0 0f 85 24 01 00 00 41 c7 07 ff ff ff ff <48> c7 c0 40 d1 b9 8c 48 c1 e8 03 42 80 3c 20 00 74 0c 48 c7 c7 40
RSP: 0018:ffffc90000007c68 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880b8e2b700 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880b8e2b700
RBP: 1ffff110171c56e1 R08: ffff8880b8e2b703 R09: 1ffff110171c56e0
R10: dffffc0000000000 R11: ffffed10171c56e1 R12: dffffc0000000000
R13: 1ffff110171c56e2 R14: ffff8880b8e2b710 R15: ffff8880b8e2b708
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563c3597e485 CR3: 000000006453f000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:150 [inline]
 _raw_spin_unlock_irqrestore+0x79/0x110 kernel/locking/spinlock.c:194
 __run_hrtimer kernel/time/hrtimer.c:1746 [inline]
 __hrtimer_run_queues+0x426/0xc40 kernel/time/hrtimer.c:1814
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:unwind_next_frame+0x1d1f/0x2970 arch/x86/kernel/unwind_orc.c:672
Code: 00 eb 05 e8 83 d0 4a 00 bf 01 00 00 00 e8 89 ae 20 00 65 8b 1d 7a f5 c8 7e 31 ff 89 de e8 19 d4 4a 00 85 db 0f 84 e6 02 00 00 <e8> 5c d0 4a 00 b0 01 e9 28 05 00 00 e8 50 d0 4a 00 48 8b 5c 24 58
RSP: 0018:ffffc9000ca77290 EFLAGS: 00000286
RAX: ffffffff813ac057 RBX: 0000000080000000 RCX: 0000000000000000
RDX: ffff88802de03c00 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000ca773c8 R08: ffff88802de03c00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc9000ca773c8
R13: dffffc0000000000 R14: ffffc9000ca77460 R15: ffffc9000ca773d8
 __unwind_start+0x66a/0x7e0 arch/x86/kernel/unwind_orc.c:760
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xf8/0x190 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1811 [inline]
 slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 __kmem_cache_free+0xba/0x1f0 mm/slub.c:3843
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1614 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x1981/0x2ac0 net/mac80211/ibss.c:1642
 ieee80211_iface_process_skb net/mac80211/iface.c:1651 [inline]
 ieee80211_iface_work+0x717/0xc70 net/mac80211/iface.c:1705
 cfg80211_wiphy_work+0x225/0x260 net/wireless/core.c:437
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>